Exclude clear_notification from being played via TTS on Alexa media_player

[mbenecke]

NOTE: For a feature to be created it has to be doable in the Amazon app because we are basically replicating the app for HA. If you can't find it in the app, we probably can't create it here.

Is your feature request related to a problem? Please describe.
I'm always frustrated when using Home Assistant Alerts with the alexa_media_player integration because the done_message (e.g., clear_notification) is forwarded and played as a voice notification via TTS on Alexa devices.

This issue typically occurs when using a Notify Group that contains both mobile phones and Alexa devices. The clear_notification is useful for clearing notifications on mobile phones, but it is unnecessary and disruptive when Alexa announces "clear_notification" via TTS.

Describe the solution you'd like
I would like an rule where specific messages are not forwarded to TTS on Alexa devices. Specifically, the clear_notification should:

1. Be processed by devices like Android phones to clear the notification.
2. Be ignored by Alexa media players to prevent it from being played via TTS.

Describe alternatives you've considered
As a workaround, I’ve considered using conditions in Home Assistant to manually avoid sending the clear_notification to Alexa devices. However, this solution is cumbersome and requires additional automations, making the system less flexible and harder to manage.

Additional context
In the current setup, every message sent via alert to Alexa devices is played via TTS. This feature would help streamline and separate how alerts are handled between different types of devices, specifically mobile phones vs. media players.

Thank you for considering this feature request!
Best regards,
Marco